NDVI

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NDVI (Normalized difference vegetation index )
and Band Ratios in Remote Sensing

• by
• Jwan M. Al-doski
• Geospatial Information Science Research Centre
  (GIS RC),
• Faculty of Engineering
• Universiti Putra Malaysia 

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First A few Simple Reminders about Spectral
Signatures
Thanks to Robin Weeks
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Laboratory Spectral Signatures IICommon Urban
Materials
Healthy grass
Concrete
Astroturf
wavelength
Thanks to Robin Weeks
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The Effect of the Atmosphere on Spectral Data
Path Radiance (Lp)
Atmospheric Transmissivity (T)
Thanks to Robin Weeks
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Effect of Topography on Scatterplots
Grassy fields
Flat terrain
Terrain without topography
Water/ shade
Bare ground
Terrain with topography
Thanks to Robin Weeks
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VegetationPigment in Plant Leaves
(Chlorophyll) strongly absorbs visible light (0.4
to 0.7 µm)Cell Structure however strongly
reflects Near-IR (0.7 1.1 µm)
Thanks to Robin Weeks
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NDVI
(courtesy http//earthobservatory.nasa.gov)
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NDVI NearIR Red / NearIR Red
Green Vegetation
Band 4
Soil
Shade/ Water
Band 3
When using LANDSAT
Simple Ratio
Band 3 Band 4
Band 4
NDVI
Band 4 - Band 3 Band 4 Band 3
Band 3
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KEY REFERENCE Kidwell, K.B., 1990, Global
Vegetation Index User's Guide, U.S. Department of
Commerce/National Oceanic and Atmospheric
Administration/National Environmental Satellite
Data and Information Service/National Climatic
Data Center/Satellite Data Services Division.
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• Thank you